JP2021098917A - Nonwoven fabric and method for manufacturing the same - Google Patents

Abstract

To provide a method for manufacturing nonwoven fabric having water absorbency and biodegradability suitable for disposable products.SOLUTION: A method for manufacturing nonwoven fabric having a spun-bonded layer 1 and a wet-web layer 2, the method including a spun-bonding step in which the spun-bonded layer 1 is formed using a resin composition selected from the group consisting of polypropylene, polyethylene, and polylactic acid by a spunbonding method so that the surface density ranges from 8 g/m2 to 10 g/m2, and a wet-web forming step in which the wet-web layer 2 is formed using wood pulp fibers by a wet-web method so that the surface density ranges from 30 g/m2 to 60 g/m2.SELECTED DRAWING: Figure 1

Description

The present invention relates to a non-woven fabric and a method for producing a non-woven fabric. This non-woven fabric has excellent water absorption and is suitable for disposable clothes and sheets.

With the progress of society and changes in lifestyle, disposable underwear, disposable sheets, disposable tablecloths, disposable napkins and medical operating tablecloths, surgical clothes, patient clothes, etc. are widely applied. Currently, many of these products use materials such as SMS non-woven fabric (spunbond, meltblown, spunbond) and plastic film. These materials have low liquid absorption performance, comfort and fastness during use. In addition, it is not biodegradable after use and has a large impact on environmental pollution at the time of disposal.

In Patent Document 1, 20 to 80% by weight of polyethylene long fiber yarn and 80 to 20% by weight of polypropylene long fiber yarn are substantially uniformly mixed, and the cross section of the polyethylene long fiber yarn is substantially circular. Further, the spunbonded nonwoven fabric characterized in that the cross section of the polypropylene long fiber yarn is hollow and substantially circular is disclosed.

Patent Document 2 is intended to provide a spunbonded non-woven fabric for clothing suitable for a surface material of sanitary materials such as diapers and sanitary napkins and a base material for clothing, and both sides of the spunbonded non-woven fabric made of polypropylene. A core-sheathed spunbonded non-woven fabric having a sheath component of polyethylene and a core component of polypropylene is laminated, and areas in which fibers are fused by heat fusion are provided at intervals. The bonded non-woven fabric is disclosed.

Japanese Unexamined Patent Publication No. 03-249254 Japanese Unexamined Patent Publication No. 11-286862

Nonwoven fabrics are widely applied to various products due to their unique three-dimensional structure and other performances such as water absorption. For example, as disclosed in Patent Document 1 and Patent Document 2, those related to thermoplastic resins such as polyethylene and polypropylene are known. However, the water absorption may be insufficient depending on the application. On the other hand, products using pulp and paper, such as tissue paper, have also been put into practical use. However, pulp and paper are easily torn and may not be used in applications that require durability.

In addition, sheets and clothes made of woven fiber materials used for medical purposes have a heavy burden of cleaning for reuse, and may be required to be easy to dispose of.

An object of the present invention is to provide a non-woven fabric having excellent water absorption and the like, which is easy to be disposable, and a method for producing the same. The present invention utilizes techniques such as non-woven fabric, melt blown, and spunlace, and relates to a high-quality non-woven fabric which is environmentally friendly, has excellent performance, and is suitable for a wide range of applications.

As a result of diligent research to solve the above problems, the present inventor has found that the following invention meets the above object, and has arrived at the present invention. That is, the present invention relates to the following invention.

<1> A method for producing a non-woven fabric having a spunbond layer and a wet web layer.
The spunbond layer is formed by a spunbond method using a resin composition containing any one selected from the group consisting of polypropylene, polyethylene, and polylactic acid so as to have a surface density of 8 to 15 g / m ^2. With the spunbond process,
A method for producing a non-woven fabric, comprising a web forming step of forming the wet web layer so as to have a surface density of 30 to 60 g / m ^{2 by a wet web method using wood pulp fibers.}
<2> The method for producing a nonwoven fabric according to <1>, wherein a laminated fiber layer having the wet web layer formed by the wet web forming step is formed on the spunbond layer formed by the spunbonding step. ..
<3> The method for producing a non-woven fabric according to <2>, which comprises a spunlacing step of forming an entangled layer in which the spunbond layer and the wet web layer of the laminated fiber layer are entangled by a non-woven fabric spunlace.
<4> It has a drying step of drying the laminated fiber layer formed by the spunlacing step with hot air drying and / or drying with a drying cylinder.
The temperature of the drying cylinder is 70 to 130 ° C., the drying time is 10 to 20 seconds, and the drying time is 10 to 20 seconds.
The method for producing a non-woven fabric according to <4>, wherein the hot air drying temperature is 70 to 100 ° C. and the drying time is 10 to 20 seconds.
<5> The method for producing a non-woven fabric according to <4>, which comprises an uneven processing step of embossing after the drying step to provide unevenness on the surface.
<6> The method for producing a non-woven fabric according to any one of <1> to <5>, wherein the content of the ultraviolet absorber and the antioxidant in the resin composition is less than 0.3% by mass.
<7> The method for producing a non-woven fabric according to any one of <1> to <6>, wherein the non-woven fabric is for sheets.
<8> A non-woven fabric having a spunbond layer and a wet web layer.
The spunbond layer is a spunbonded nonwoven fabric of a resin composition containing any one selected from the group consisting of polypropylene, polyethylene and polylactic acid, and has a surface density of 8 to 15 g / m ² .
The wet web layer is a web layer of wood pulp fibers and has a surface density of 30 to 60 g / m ² .
A non-woven fabric in which the spunbond layer and the wet web layer are entangled.

According to the present invention, a non-woven fabric having excellent water absorption and suitable for disposable clothes and sheets is provided.

It is a schematic cross-sectional view of the structure which concerns on embodiment of the nonwoven fabric of this invention. It is a flow figure for demonstrating the example of the manufacturing process of the nonwoven fabric which concerns on this invention. It is an image which imaged the non-woven fabric which concerns on Example. It is a figure which shows the result of the wiping test with the non-woven fabric which concerns on Example.

Hereinafter, embodiments of the present invention will be described in detail, but the description of the constituent elements described below is an example (representative example) of the embodiments of the present invention, and the present invention is described below unless the gist thereof is changed. It is not limited to the contents of. When the expression "-" is used in the present specification, it is used as an expression including numerical values before and after the expression.

[Method for manufacturing non-woven fabric of the present invention]
The method for producing a non-woven fabric of the present invention is a method for producing a non-woven fabric having a spunbond layer and a wet web layer, and the spunbond layer is selected from the group consisting of polypropylene, polyethylene, and polylactic acid. ^{A spunbonding step of forming a surface density of 8 to 15 g / m 2} by a spunbonding method using a resin composition containing the mixture and a surface of the wet web layer by a wet web method using wood pulp fibers. It has a wet web forming step of forming so as to have a density of 30 to 60 g / m ^2.

[Nonwoven fabric of the present invention]
A non-woven fabric having a spunbond layer and a wet web layer, wherein the spunbond layer is a spunbond non-woven fabric having a resin composition containing any one selected from the group consisting of polypropylene, polyethylene and polylactic acid, and has a surface density. Is 8 to 15 g / m ² , the wet web layer is a web layer of wood pulp fibers, the surface density is 30 to 60 g / m ² , and the spunbond layer and the wet web layer are entangled with each other. It was done.

By combining a spunbond layer having a surface density of 8 to 15 g / m ² and a web layer of wood pulp fibers having a surface density of 30 to 60 g / m ² , the wood pulp fiber is excellent. By further entwining with the spunbond layer, it is possible to obtain a non-woven fabric having a strength suitable for temporary use as sheets or clothes having excellent mechanical strength. Further, from the viewpoint of forming a non-woven fabric sheet having a sufficient thickness by setting such a surface density, it is suitable for sheets, clothes and the like.

Further, since the wood pulp fiber has biodegradability and this wood pulp fiber is the main raw material, the non-woven fabric of the present invention can be decomposed by microorganisms to reduce the volume. Further, the resin composition used for the spunbond layer is photodegradable or biodegradable, so that the environmental load at the time of disposal and treatment can be further reduced. These also contribute to the reduction of disposal costs.

In the non-woven fabric of the present invention, the mass ratio of the resin composition of the spunbond layer to the wood pulp fiber of the web layer (resin composition: wood pulp fiber) is preferably 30:70 to 10:90. , 25:75 to 15:85, more preferably 22:78 to 18:82. In particular, it is preferably 20:80. As described above, the large amount of wood pulp fiber makes it possible to have excellent water absorption, and it is possible to reduce the environmental load when disposing of the material assuming that it is disposable. On the other hand, if the amount of the resin composition is too small, the mechanical strength for use as various clothes or the like may be insufficient.

FIG. 1 is a schematic cross-sectional view for explaining the structure of the nonwoven fabric of the present invention. As shown in FIG. 1, the non-woven fabric according to the present invention has a spunbond layer 1 and a wet web layer 2. The spunbond layer 1 is formed using a resin composition containing any one selected from the group consisting of polypropylene, polyethylene, and polylactic acid. This layer is formed by the spunbond method. The wet web layer 2 is a web layer formed by using wood pulp fibers. This layer is formed by the wet web method. This layer has an area density of 30-60 g / m ² .

The nonwoven fabric of the present invention can be produced by using the method for producing a nonwoven fabric of the present invention, and the configurations corresponding to each of them in the present application can be mutually used.

[Non-woven fabric manufacturing process]
FIG. 2 is a flow chart for explaining a typical form of the method for producing a nonwoven fabric of the present invention. In manufacturing this non-woven fabric, first, a span bond layer is formed by the span bond step S11. Next, in the wet web step S21, a wet web layer is formed on the spunbond layer to obtain a laminated fiber layer having the spunbond layer and the wet web layer. Next, in the span race step S31, the laminated fiber layer is treated to obtain an entangled layer in which the spunbond layer and the wet web layer are entangled. Then, in the drying step S41, the entangled layer can be dried to obtain a non-woven fabric.

[Span bond process]
The method for producing a non-woven fabric of the present invention relates to a method for producing a non-woven fabric having a spunbond layer and a wet web layer. The method for producing a non-woven fabric of the present invention uses a resin composition containing a spunbond layer selected from the group consisting of polypropylene, polyethylene, and polylactic acid by a spunbond method to have a surface density of 8 to 15 g / g. It has a spunbonding step of forming so as to be ^{m 2.} In the spunbond method, continuous long fibers obtained by melting and spinning a resin composition as a raw material are directly accumulated to form a web-like shape. This resin composition preferably has a melting index MFR of 70 to 90 g / 10 min.

The lower limit of the surface density of the spunbond layer ^{is more preferably 9 g / m 2} or more, further preferably 10 g / m ^{2 or more.} The upper limit of the surface density of the spunbond layer is more preferably ^{14 g / m 2} or less and 13 g / m ^{2 or less.} If the surface density of the spunbond layer is too low, the strength of the non-woven fabric may decrease, and the spunbond layer may be easily damaged. If the surface density is too high, it may be difficult to bend and handle.

As the resin composition, polypropylene, polyethylene, or polylactic acid may be used alone, or a plurality of them may be used in combination. In particular, from the viewpoint of ease of control of manufacturing conditions, it is preferable to use any one of them alone. In particular, polypropylene is preferably used as the resin composition.

The resin composition preferably contains less than 0.3% by mass of the ultraviolet absorber and the antioxidant. The non-woven fabric of the present invention and the resin composition used in the method for producing the non-woven fabric of the present invention are decomposed by being exposed to light such as ultraviolet rays. Therefore, when the non-woven fabric is discarded, it can be decomposed by exposing it to natural light or the like to reduce the volume of the waste.

[Wet web process]
The method for producing a non-woven fabric of the present invention includes a web forming step of forming a wet web layer of the non-woven fabric by a wet web method using wood pulp fibers so that the surface density is 30 to 60 g / m ^2. In performing this web forming step, it is preferable to form a laminated fiber layer in which a wet web layer is formed by the web forming step on the spunbond layer formed by the spunbonding step.

The lower limit of the surface density of the wet web layer, 35 g / m ² or more preferably, 40 g / m ² or more is more preferable. The upper limit of the surface density of the wet web layer is more preferably ^{55 g / m 2} or less and 50 g / m ^{2 or less.} If the surface density of the wet web layer is too low, water absorption and the like may not be sufficiently exhibited. If the surface density of the wet web layer is too high, it may be difficult to bend and handle it.

The web forming step is performed in the case of making paper or the like, in which very short fibers of pulp fibers are dispersed in water and scooped up on a net-like net to form a web shape. More specifically, for example, it can be performed as follows. A slurry in which wood pulp fibers are uniformly agitated in water is formed. Then, the slurry containing the pulp fibers is rapidly injected into the slurry storage tank of the wet web manufacturing facility. In this slurry storage tank, the slurry is uniformly dispersed while being continuously stirred, the dehydration valve is opened to quickly discharge the water, and the wood pulp fibers are formed into a web shape on the molding net by the action of water pressure. .. Further, a web of this wood pulp fiber is formed on the spunbond layer by a press pan lace needle.

[Span lace process]
The method for producing a non-woven fabric of the present invention preferably includes a spunlacing step of forming an entangled layer in which a spunbond layer of a laminated fiber layer and a wet web layer are entangled with a non-woven fabric spunlace. By being entangled by this spunlace, the spunbond layer and the wet web layer are more integrated and reinforced. Further, it is possible to obtain a product that is intricately entangled with each other so that the wood pulp fibers enter the spunbond layer and is integrated without using an adhesive.

This spunlace is manufactured by entwining the fibers of the web, which is a laminated fiber layer, with a high-pressure water stream. In the spunlacing process, for example, a high-pressure water needle is formed in high-pressure water via a water jet plate, densely sprayed on a fiber net, displacement and entanglement are generated in the fibers of the fiber net, and the spunlace pressure is 15 to 15 to It can be processed at 80 MPa. After spunlacing, excess water is removed through negative pressure suction and rolling with a mangle roller.

[Drying process]
The method for producing a non-woven fabric of the present invention preferably includes a drying step of drying the laminated fiber layer formed by the spunlacing step with hot air drying and / or drying with a drying cylinder. It is preferable that the temperature of the drying cylinder is 70 to 130 ° C. and the drying time is 10 to 20 seconds. It is preferable that the temperature of this hot air drying is 70 to 100 ° C. and the drying time is 10 to 20 seconds. In the treatment tank where the spunlace process is performed, the high-pressure water flow in the spunlace process is removed by negative pressure suction or the like, but the water remaining in the laminated fiber layer is sufficiently removed, and the resin composition is partially plasticized. Drying with such heating is effective in order to improve the unity as a state of being made. Those having the laminated fiber layer treated in this way can be used as they are as the non-woven fabric of the present invention.

[Concavo-convex processing process]
The method for producing a non-woven fabric of the present invention may further perform an embossing process or the like to perform a concavo-convex processing step to obtain a non-woven fabric having unevenness. By providing such unevenness in a pattern, the area where the non-woven fabric comes into contact with various objects can be adjusted. By adjusting the contact area, it can be made slippery and easy to handle, or it can be made soft to the touch. In addition, dirt and the like can be removed so as to be entangled between the irregularities.

The uneven processing is preferably embossing. This embossing is preferably performed at a temperature of 80 to 120 ° C. and a pressure of 1.2 to 2.0 MPa. Further, it is preferable that the embossed pattern is a regular hexagon having a width of 5 to 10 mm and a convex portion at the center, sandwiching a groove having a concave portion of about 0.2 to 1.0 mm, and being regularly arranged. If it is a regular hexagon, it is easy to perform regular arrangement without gaps by providing stripes in a continuous arrangement on the left and right and arranging the stripes vertically with the phases shifted. Further, since the unevenness is arranged in a plurality of directions in the plane, stress is less likely to be concentrated in any direction, and the product can be used without discomfort even if it is bent or pulled. In addition, since the concave portion and the convex portion are shaped to face various directions, even if the water or solid matter is wiped off carelessly, the groove or the like in either direction becomes the direction suitable for the wiping, which is easy. Can be wiped off.

The non-woven fabric of the present invention relates to a non-woven fabric having excellent water absorption. In addition, the environmental load at the time of disposal can be reduced. Further, since the non-woven fabric of the present invention uses a resin or the like that is widely used in other fields, it can be manufactured at low cost.

In addition, as a performance index of the non-woven fabric of the end name, it can be used as an index that the following conditions are satisfied. (1) The physicochemical properties and appearance quality of the product can be referred to the disposable hygiene product hygiene standard GB15979-2002. (2) The product meets the environmental protection standards. (3) The product can be antibacterial treated.

[Use of non-woven fabric, etc.]
The non-woven fabric of the present invention is suitable for clothing, home textiles, medical applications, and the like. In particular, it is suitable for disposable cloth products such as sheets and medical bedding, which are used in medical settings. More specifically, it is suitable for disposable bed sheets such as hospitals, nursing homes, hotels, inns, lodgings, and dormitories. It is also suitable for duvet covers, work apron in kitchens, hand towels and hand towels before meals, cloths, rags, excrement and dirt wipe sheets for infants, the elderly and pets.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples unless the gist thereof is changed.

[Manufacturing Example 1]
(Step 1) Using the polypropylene resin (1), a non-woven fabric was formed so that the ^{surface density was 12 g / m 2 by the span bond method to form the spun bond layer (1).} The polypropylene resin (1) used had an MFR of 80 g / 10 min, a content of an ultraviolet absorber and an antioxidant of less than 0.1% by mass, and no additives or the like was added.
(Step 2) By the wet web method, a wet web layer (1) was formed on the spunbond layer (1) so that the surface density of the wood pulp fibers was 48 g / m ^2.
(Step 3) A laminated fiber layer (1) in which a spunbond layer (1) and a wet web layer (1) are laminated is entangled with a non-woven fabric spunlace to form an entangled layer (1). The spunlace condition was that the spunlace pressure was about 45 MPa, and after the spunlace was performed, negative pressure suction and rolling with a 10,000-guru roller were performed to remove excess water.
(Step 4) The non-woven fabric (1) was obtained by drying with hot air so that the drying time at 90 ° C. was 15 seconds. The non-woven fabric (1) has a relatively smooth surface in appearance visually. The measured value of the surface density of the non-woven fabric (1) was 59.5 g / m ² .

[Manufacturing Example 2]
The non-woven fabric (1) according to Production Example 1 was subjected to the following treatment (step 5) to obtain a non-woven fabric.
(Step 5) Embossing was performed so that regular hexagons having a width of about 6 mm were regularly arranged on the non-woven fabric (1) with grooves at intervals of about 0.5 mm. In this embossing process, a convex portion toward the center of a regular hexagon and a concave portion (groove having a width of about 0.5 mm) are formed around the convex portion. In the embossing process, the non-woven fabric (1) was pressed at about 90 ° C. and a pressure of 1.5 MPa using a mold having such a pattern. The non-woven fabric (2) having irregularities formed by embossing was used. The measured value of the surface density of the non-woven fabric (2) was 59.7 g / m ² .
An image of the surface of the non-woven fabric according to Production Example 2 is shown in FIG.

[Comparative Example 1]
A commercially available cloth having a surface density of 106.4 g / m ² (woven cloth having 60 vertical and horizontal supports) was used as a general cloth to be compared.
[Comparative Example 2]
A commercially available cloth having a surface density of 125.5 g / m ² (woven cloth having 40 vertical and horizontal supports) was used as a general cloth to be compared.

[Evaluation item]
(1) Area density: Evaluation was made with reference to the standard of GB / T2418.1-2009.
(2) Thickness: GB / T2418.2-2009 9. Evaluation was made with reference to the test steps.
(3) Water absorption rate: GB / T2418.6-2010 5. It was evaluated with reference to the amount of liquid absorbed.
(4) Breathability: Evaluated with reference to the GB / T24218.15-2018 standard.
(5) Heat retention: Evaluation was made with reference to the GB / T11048-2018 standard.
These evaluation methods refer to the People's Republic of China National Standard (GB Standard).

Further, the non-woven fabric according to Production Example 2 was excellent in breaking strength exceeding 20 N / 5 cm and exceeding 18 N / 5 cm even in a wet state when a tensile test was performed in a width direction orthogonal to the winding direction of the production line in a horizontal plane. It had strength. Further, when the tensile test was performed in the direction parallel to the winding direction of the production line, it had an excellent strength of more than 35 N / 5 cm and more than 28 N / 5 cm even in a wet state.

The non-woven fabrics according to Production Examples 1 and 2 have an excellent water absorption rate even though they have the same thickness and a lower surface density than the commercially available woven fabrics according to Comparative Examples 1 and 2. Further, the non-woven fabrics according to Production Examples 1 and 2 maintain appropriate air permeability and are also excellent in heat retention. Further, although it has a layer using wood pulp fiber, it has excellent tensile strength. As described above, the non-woven fabrics of Production Examples 1 and 2 are suitable for wiping off dirt and sweat, and are light and have excellent heat retention, so that they are suitable for wiping sheets, clothes, and the like.

[Wipe test]
A wiping test and the like were performed using the non-woven fabric according to Production Examples 1 and 2.
As a wiping operation, 20 mL of each test stain was placed on a white resin plate, and then the non-woven sheets were bundled and held in the hand, and the stain was wiped from the top to the bottom 5 times. By observing the situation after wiping, the wiping property due to the excellent water absorption of the non-woven fabric according to the present invention and the influence of the presence or absence of unevenness due to embossing were evaluated.

As the wiping target, the following were used as the ones containing colored liquids, slurries containing solids, and those containing oils, assuming that filth such as manure was also assumed.
Objects for test stains: red miso, coffee, mud, ketchup, sauce, Chinese seasoning tianmian sauce.

The results of the wiping test are shown in FIG. It should be noted that the embossed product according to Production Example 2 was able to remove stains more remarkably. The result of the wiping test according to Production Example 2 relating to this embossed product was visually evaluated with an index of "⊚: completely removed, ◯: roughly removed, Δ: remaining part remaining, ×: unremovable".
In addition, Production Example 2 and Production Example 1 were compared and evaluated with an index of "○": the embossed product was superior, Δ: the same degree, and ×: the one without embossing was superior.

Both of the non-woven fabrics of Production Examples 1 and 2 showed an excellent effect on stains mainly composed of liquids such as coffee and sauce. In addition, all non-woven fabrics have sufficient strength and do not tear due to wiping friction, etc., and have an appropriate thickness and water absorption, so that they can be used comfortably with the hands of the operator without feeling soaked in wetness. there were.

For slurries containing solids and relatively high-viscosity red miso, mud, ketchup, and Chinese seasoning tianmian sauce, the embossed non-woven fabric of Production Example 2 has better wiping properties. Was there. It is considered that this is because the solid matter and the like are entangled in the embossed groove and the like, and the liquid is absorbed by the thick layer of the convex portion.

The non-woven fabric of the present invention can be used for disposable clothes and sheets, and is industrially useful.

1 spunbond layer 2 wet web layer

Claims (8)

A method for producing a non-woven fabric having a spunbond layer and a wet web layer.
The spunbond layer is formed by a spunbond method using a resin composition containing any one selected from the group consisting of polypropylene, polyethylene, and polylactic acid so as to have a surface density of 8 to 15 g / m ^2. With the spunbond process,
A method for producing a non-woven fabric, comprising a wet web forming step of forming the wet web layer so as to have a surface density of 30 to 60 g / m ^{2 by a wet web method using wood pulp fibers.} The method for producing a non-woven fabric according to claim 1, wherein a laminated fiber layer in which the wet web layer is formed by the wet web forming step is formed on the spunbond layer formed by the spunbonding step. The method for producing a non-woven fabric according to claim 2, further comprising a spunlacing step of forming an entangled layer in which the spunbond layer and the wet web layer of the laminated fiber layer are entangled with a non-woven fabric spunlace. It has a drying step of hot air drying and / or drying of the confounding layer formed by the spunlacing step with a drying cylinder.
The temperature of the drying cylinder is 70 to 130 ° C., the drying time is 10 to 20 seconds, and the drying time is 10 to 20 seconds.
The method for producing a non-woven fabric according to claim 3, wherein the hot air drying temperature is 70 to 100 ° C. and the drying time is 10 to 20 seconds. The method for producing a non-woven fabric according to claim 4, further comprising an uneven processing step of embossing after the drying step to provide unevenness on the surface. The method for producing a non-woven fabric according to any one of claims 1 to 5, wherein the content of the ultraviolet absorber and the antioxidant in the resin composition is less than 0.3% by mass. The method for producing a non-woven fabric according to any one of claims 1 to 6, wherein the non-woven fabric is for sheets. A non-woven fabric having a spunbond layer and a wet web layer.
The spunbond layer is a spunbonded nonwoven fabric of a resin composition containing any one selected from the group consisting of polypropylene, polyethylene and polylactic acid, and has a surface density of 8 to 15 g / m ² .
The wet web layer is a web layer of wood pulp fibers and has a surface density of 30 to 60 g / m ² .
A non-woven fabric in which the spunbond layer and the wet web layer are entangled.

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